The companies project ClassifiedWarehouse.com's fully searchable classified advertising database to double to six million from three million new ads per month by the end of the first half of the year.

The new company, known as AdOne, L.L.C., is the first purely Internet start-up backed by a consortium composed of major, traditional media and new media companies, the consortium said in a statement.

The media companies represent four of the top ten U.S. newspaper media companies with market penetration in 38 of the top 50 U.S. media markets and more than 350 affiliated media properties in the top 50 markets.

AdOne will tout itself as the highest quality, most comprehensive collection of Internet classifieds updated daily from leading newspapers and top-brand online providers.

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